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New Zealand uses 230V and AS/NZS 3112 plug:
You need to check first that all your chargers support also 230V (iDevices chargers normally are 100-240V) after you need a travel adapter, like this one:
Because you will stay 9 months, for your iPad and iPhone you can consider buy in New Zealand the Apple 12W USB Power adapter, it is able to charge several Apple devices.